#include<iostream>
#include<vector>

using namespace std;

class Solution {
public:
    int takeAttendance(vector<int>& nums) {
        int left = 0, n = nums.size(), right = n - 1;
        while (left < right)
        {
            int mid = left + (right - left) / 2;
            if (nums[mid] == mid)
            {
                left = mid + 1;
            }
            else
            {
                right = mid;
            }
        }

        if (nums[left] == left)
        {
            return left + 1;
        }


        return left;
    }
};


int main()
{
    return 0;
}